diff options
| author | Anthony G. Basile <blueness@gentoo.org> | 2014-09-07 15:33:46 -0400 |
|---|---|---|
| committer | Bernhard Reutner-Fischer <rep.dot.nop@gmail.com> | 2014-09-09 13:48:45 +0200 |
| commit | 33a12b5540b8abbc4ee0ecb3a51912b3c7868517 (patch) | |
| tree | 399a161fa8ae09eab39c25f17686c496a05b9b2b /libc/sysdeps/linux/common/fallocate.c | |
| parent | 7efe10ec5fc772f5328b35ba6716bde815212b45 (diff) | |
libc: add fallocate() and fallocate64()
We add the Linux-specific function fallocate() which allows the user to
directly manipulate allocate space for a file. fallocate() can operate
in different modes, but the default mode is equivalent to posix_fallocate()
which is specified in POSIX.1.
Recent releases of e2fsprogs 1.42.11 and above expect fallocate64() to be
available.
Signed-off-by: Anthony G. Basile <blueness@gentoo.org>
Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>
Diffstat (limited to 'libc/sysdeps/linux/common/fallocate.c')
| -rw-r--r-- | libc/sysdeps/linux/common/fallocate.c | 48 |
1 files changed, 48 insertions, 0 deletions
diff --git a/libc/sysdeps/linux/common/fallocate.c b/libc/sysdeps/linux/common/fallocate.c new file mode 100644 index 000000000..b23122669 --- /dev/null +++ b/libc/sysdeps/linux/common/fallocate.c @@ -0,0 +1,48 @@ +/* vi: set sw=4 ts=4: */ +/* + * fallocate() for uClibc - Based off of posix_fallocate() by Erik Andersen + * http://www.opengroup.org/onlinepubs/9699919799/functions/posix_fallocate.html + * + * Copyright (C) 2000-2006 Erik Andersen <andersen@uclibc.org> + * + * Licensed under the LGPL v2.1 or later, see the file COPYING.LIB in this tarball. + */ + +#include <sys/syscall.h> +#include <fcntl.h> +#include <bits/kernel-features.h> +#include <stdint.h> + +#if defined __NR_fallocate +extern __typeof(fallocate) __libc_fallocate attribute_hidden; +int attribute_hidden __libc_fallocate(int fd, int mode, __off_t offset, __off_t len) +{ + int ret; + +# if __WORDSIZE == 32 + uint32_t off_low = offset; + uint32_t len_low = len; + /* may assert that these >>31 are 0 */ + uint32_t zero = 0; + INTERNAL_SYSCALL_DECL(err); + ret = (int) (INTERNAL_SYSCALL(fallocate, err, 6, fd, mode, + __LONG_LONG_PAIR (zero, off_low), + __LONG_LONG_PAIR (zero, len_low))); +# elif __WORDSIZE == 64 + INTERNAL_SYSCALL_DECL(err); + ret = (int) (INTERNAL_SYSCALL(fallocate, err, 4, fd, mode, offset, len)); +# else +# error your machine is neither 32 bit or 64 bit ... it must be magical +# endif + if (unlikely(INTERNAL_SYSCALL_ERROR_P (ret, err))) + return INTERNAL_SYSCALL_ERRNO (ret, err); + return 0; +} + +# if defined __UCLIBC_LINUX_SPECIFIC__ && defined __USE_GNU +strong_alias(__libc_fallocate,fallocate) +# if __WORDSIZE == 64 +strong_alias(__libc_fallocate,fallocate64) +# endif +# endif +#endif |